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Ant example source code file (Comparison.java)

This example Ant source code file (Comparison.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

buildexception, comparison, comparison, enumeratedattribute, equal_index, greater_equal, greater_index, greater_index, less, less_index, string, string, util, values, values

The Comparison.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package org.apache.tools.ant.types;

import java.util.Arrays;

import org.apache.tools.ant.BuildException;

/**
 * EnumeratedAttribute for generic comparisons.  Accepts values
 * "equal", "greater", "more", "less", "ne" (not equal),
 * "ge" (greater or equal), "le" (less or equal), "eq" (equal),
 * "gt" (greater), "lt" (less).
 * @since Ant 1.7
 */
public class Comparison extends EnumeratedAttribute {
    private static final String[] VALUES
        = new String[] {"equal", "greater", "less",
                        "ne", "ge", "le", "eq", "gt", "lt", "more"};

    /** Equal Comparison. */
    public static final Comparison EQUAL = new Comparison("equal");

    /** Not-Equal Comparison. */
    public static final Comparison NOT_EQUAL = new Comparison("ne");

    /** Greater Comparison. */
    public static final Comparison GREATER = new Comparison("greater");

    /** Less Comparison. */
    public static final Comparison LESS = new Comparison("less");

    /** Greater-or-Equal Comparison. */
    public static final Comparison GREATER_EQUAL = new Comparison("ge");

    /** Less-or-Equal Comparison. */
    public static final Comparison LESS_EQUAL = new Comparison("le");

    private static final int[] EQUAL_INDEX = {0, 4, 5, 6};
    private static final int[] LESS_INDEX = {2, 3, 5, 8};
    private static final int[] GREATER_INDEX = {1, 3, 4, 7, 9};

    /**
     * Default constructor.
     */
    public Comparison() {
    }

    /**
     * Construct a new Comparison with the specified value.
     * @param value the EnumeratedAttribute value.
     */
    public Comparison(String value) {
        setValue(value);
    }

    /**
     * Return the possible values.
     * @return String[] of EnumeratedAttribute values.
     */
    public String[] getValues() {
        return VALUES;
    }

    /**
     * Evaluate a comparison result as from Comparator.compare() or Comparable.compareTo().
     * @param comparisonResult the result to evaluate.
     * @return true if the comparison result fell within the parameters of this Comparison.
     */
    public boolean evaluate(int comparisonResult) {
        if (getIndex() == -1) {
            throw new BuildException("Comparison value not set.");
        }
        int[] i = comparisonResult < 0 ? LESS_INDEX
            : comparisonResult > 0 ? GREATER_INDEX : EQUAL_INDEX;
        return Arrays.binarySearch(i, getIndex()) >= 0;
    }

}

Other Ant examples (source code examples)

Here is a short list of links related to this Ant Comparison.java source code file:

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